Conductor released a study that analyzed the ten blue links at Google showing 34% show rich media, nine organic listings and nine search ads.
The Conductor study showed that there was rich media on the search results page 34% of the time. The breakdown of rich media showed images appear on 28% of search results pages, news 9%, and shopping 1%. You have to keep in mind, rich media in search results is incredibly query-dependent. So, based on the sampling of Conductor’s study, 34% was the number they reached.